https://bugzilla.kernel.org/show_bug.cgi?id=88921
--- Comment #4 from Eduard Bloch blade@debian.org --- Created attachment 162051 --> https://bugzilla.kernel.org/attachment.cgi?id=162051&action=edit dmesg covering X server lockup
This becomes more and more weird. Sometimes I can boot the system and I can suspend it five times per day with no issues. Sometimes it reboots as described in the original description.
And sometimes it seems to hang for about 10 seconds before the fans are turned off (this feels like with pre-3.13rcX kernels). When I resume it, the X picture is frozen. But I still can switch to the FB console and kill X from there. However, when X is restarted, it feels slightly sluggish, like having no accelleration in some applications. I haven't tested movie playback or other things in that mode yet, and Firefox freezes at 100% CPU time when I visit some sites like *sic* kernel bugzilla.
All that obvservations with the same kernel 3.18.1. I added the dmesg look again, it contains something about r600 exception which looked related.